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Viktor Dušenka

@viktorduenka

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Experienced Java developer focused on backend systems, integrations, and test automation.

Slovakia

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What I'm looking for

I seek backend or integration roles focusing on stable, high-impact systems, automation, continuous learning, and collaborative teams with growth opportunities.

I am an experienced Java developer specializing in maintaining high-availability financial systems, building integrations with MuleSoft, and architecting test automation solutions using Python and Robot Framework. I have delivered production-critical features across banking, enterprise integrations, and bespoke desktop applications while improving stability, performance, and security.

I design and implement REST APIs, connectors, and RAG chatbot prototypes, and I actively explore functional languages like Clojure in my free time. I am collaborative, continuously learning, and committed to creating scalable, maintainable solutions that reduce manual effort and increase test coverage.

Experience

Work history, roles, and key accomplishments

Current

Java Developer

Current

Unknown (bank)

Jan 2025 - Present (9 months)

Key contributor to development and maintenance of a high-availability legacy financial investigation system handling payment exceptions; engineered fixes and features for complex Java codebase and modernized QA with a Python/Robot Framework test automation library to increase regression coverage.

Java Legacy Systems Python Robot Framework Test Automation Debugging

Teacher of Applied Informatics

SSO ELBA

Jan 2024 - Jan 2025 (1 year)

Taught applied informatics (Java) three hours weekly, delivering practical language instruction and exercises to secondary students.

Java Teaching Classroom Instruction Lesson planning

Java Developer

hotovo s.r.o.

Jan 2020 - Jan 2025 (5 years)

Developed and maintained MuleSoft connectors for integrations (NetSuite, Zendesk, Google Sheets, Gmail, AWS SNS/SQS), implemented authentication schemes and FIPS compliance; built a RAG chatbot with FastAPI and OpenAI, preprocessing documents and integrating PostgreSQL and web UI.

Java MuleSoft OAuth AWS SQS PostgreSQL fastAPI OpenAI RAG Integration

Java Developer

Fio banka

Jan 2020 - Dec 2020 (11 months)

Analyzed and proposed performance optimizations for a Swing-based Java application supporting employee workflows; produced a refactoring and optimization roadmap prior to project cancellation.

Performance Analysis Refactoring Performance Optimization Documentation

Java Developer

Spinea s.r.o.

Jan 2018 - Dec 2020 (2 years 11 months)

Designed and implemented a Swing-based application for managing precision gear lifecycles, integrated with Oracle DB and QAD ERP to improve planning and reporting.

Oracle ERP Integration Data Modeling Reporting SQL

Java Developer

BSC Prešov, spol. s.r.o.

Jan 2016 - Dec 2018 (2 years 11 months)

Developed and maintained internet banking web applications for multiple banks, implemented SEPA payment processing and backend Java EE features, and improved DB performance with Java stored procedures and query optimization.

Java EE SEPA JSP JavaScript Oracle Maven Jenkins CI CD SQL Optimization

Delphi Programmer

eNnova s.r.o.

Jan 2012 - Dec 2016 (4 years 11 months)

Identified and resolved defects in a critical client application for Draeger, improving performance, reliability, and maintainability through Delphi best practices.

Delphi Debugging Performance Tuning client support Maintenance